rsa_generate_key_example.c

#include <stdio.h>

#include <openssl/bn.h>
#include <openssl/rsa.h>

int main()
{
    RSA *r;

    r = RSA_generate_key(2048,RSA_F4,NULL,NULL);

    if( r==NULL ) {
        printf("Key failed");
        exit(1);
    } else {
        printf("public modulus (n):\n");
        printf("   %s\n",BN_bn2hex(r->n));

        printf("public exponent (e):\n");
        printf("   %s\n",BN_bn2hex(r->e));

        printf("private exponent (d):\n");
        printf("   %s\n",BN_bn2hex(r->d));

        printf("secret prime factor (p):\n");
        printf("   %s\n",BN_bn2hex(r->p));
        printf("secret prime factor (q):\n");
        printf("   %s\n",BN_bn2hex(r->q));

        printf("dmp1 [ d mod (p-1) ]:\n");
        printf("   %s\n",BN_bn2hex(r->dmp1));
        printf("dmq1 [ d mod (q-1) ]:\n");
        printf("   %s\n",BN_bn2hex(r->dmq1));

        printf("iqmp [ q^-1 mod p ]:\n");
        printf("   %s\n",BN_bn2hex(r->iqmp));
    }

    printf("RSA SIZE: %d\n", RSA_size(r));

    return(0);
}